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The interface for an algorithm used to sign and verify tokens.
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Returns a digital signature for the specified message
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Verifies that the specified digital signature is valid
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Performs signing and verification operations using
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Performs signing and verification operations using Ed25519
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Sign a message ``msg`` using the Ed25519 private key ``key``
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:return bytes signature: The signature, as bytes
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:return bool verified: True if signature is valid, False if not.
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